From:             
Operating system: Ubuntu Linux
PHP version:      5.3.6
Package:          Compile Failure
Bug Type:         Bug
Bug description:instanceof does not complain even if class is never defined

Description:
------------
PHP does not complain if you check for non-existant class with instanceof.

This provides space for subtle errors, like checking for DateRange when
only Date_Range class is defined.

Test script:
---------------
<?php
echo PHP_VERSION . "\n";
error_reporting(E_ALL);
class Foo {}
$a = new Foo;
// Notice that Bar class is never defined, however PHP does not complain
about missing class.
if ($a instanceof Bar) { echo "Should be an error\n"; }
else { echo "PHP fail\n"; }

Expected result:
----------------
Compiler error thrown saying that Bar was not found.

Actual result:
--------------
Nothing happens.

-- 
Edit bug report at https://bugs.php.net/bug.php?id=55246&edit=1
-- 
Try a snapshot (PHP 5.2):            
https://bugs.php.net/fix.php?id=55246&r=trysnapshot52
Try a snapshot (PHP 5.3):            
https://bugs.php.net/fix.php?id=55246&r=trysnapshot53
Try a snapshot (trunk):              
https://bugs.php.net/fix.php?id=55246&r=trysnapshottrunk
Fixed in SVN:                        
https://bugs.php.net/fix.php?id=55246&r=fixed
Fixed in SVN and need be documented: 
https://bugs.php.net/fix.php?id=55246&r=needdocs
Fixed in release:                    
https://bugs.php.net/fix.php?id=55246&r=alreadyfixed
Need backtrace:                      
https://bugs.php.net/fix.php?id=55246&r=needtrace
Need Reproduce Script:               
https://bugs.php.net/fix.php?id=55246&r=needscript
Try newer version:                   
https://bugs.php.net/fix.php?id=55246&r=oldversion
Not developer issue:                 
https://bugs.php.net/fix.php?id=55246&r=support
Expected behavior:                   
https://bugs.php.net/fix.php?id=55246&r=notwrong
Not enough info:                     
https://bugs.php.net/fix.php?id=55246&r=notenoughinfo
Submitted twice:                     
https://bugs.php.net/fix.php?id=55246&r=submittedtwice
register_globals:                    
https://bugs.php.net/fix.php?id=55246&r=globals
PHP 4 support discontinued:          
https://bugs.php.net/fix.php?id=55246&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=55246&r=dst
IIS Stability:                       
https://bugs.php.net/fix.php?id=55246&r=isapi
Install GNU Sed:                     
https://bugs.php.net/fix.php?id=55246&r=gnused
Floating point limitations:          
https://bugs.php.net/fix.php?id=55246&r=float
No Zend Extensions:                  
https://bugs.php.net/fix.php?id=55246&r=nozend
MySQL Configuration Error:           
https://bugs.php.net/fix.php?id=55246&r=mysqlcfg
Try a snapshot (PHP 5.4):            
https://bugs.php.net/fix.php?id=55246&r=trysnapshot54

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